210 AUSTRALIAN MALACOSTBACA. 



each side of the median keel (the inner of the two being much 

 less strongly marked), with a third carina on each side close to 

 the lateral margin ; six lateral spines, the two mobile and sub- 

 median spines being the longest. Dactyli of raptorial limbs 

 armed with three slender spines (including the terminal spine 

 which is longest). Terminal spines of the basal prolongation of 

 the uropoda nearly equal ; inner spine not toothed on its outer 

 margin. Length nearly 3 in. [J/".] 



Widely distributed throughout the Indo-Pacific region, and 

 found also at the Mauritius, in the Keel Sea, and at Cuba. 



Grenus G-onodactylus, Latr. 



Allied to PseudosquiUa, but with the penultimate joint of the 

 raptorial limbs not armed with minute pectinately-disposed teeth, 

 and with the dactylus considerably dilated at the base ; the 

 mobile spines at the distal extremity of the telson small or 

 obsolete. 



388. Gonodactylus chiragra. A.M. 



Squilla chiragra, Fabr., Ent. Syst., ii., p. 513, Supp., p. 417 ; 

 Desmarest, Consid., p. 251, pi. xliii. 



Cancer (Mantis) chiragra, Herbst, Naturg. Krabben, &c, ii., 

 p. 100, pi. xxxiv., fig. 2. 



Gonodactylus chiragra, Latr., Encycl., x., p. 473 ; M.-Edw., 

 Hist. Nat. Crust., ii., p. 528 ; White, List Crust. Brit. Mus., 

 p. 84 ; Dana, IT. S. Explor. Exped., Crust., i., p. 623, pi. xli., 

 fig. 5 ; Heller, Keise Novara, Crust., p. 120 ; Miers, Phil. Trans., 

 clxviii., p. 495 ; Ann. Mag. N. H. (5), v., p. 118. 



Carapace smooth, nearly oblong, with the sides parallel, the 

 antero-lateral and postero-lateral angles unarmed and rounded. 

 Median spine of rostrum long and acute, its lateral lobes but 

 little prominent and rounded. First exposed thoracic segment 

 not produced ; lateral process of the second segment somewhat 

 rounded, that of the third segment sub-truncate, and that of the 

 fourth segment narrowed towards the lateral margin. Lateral 

 margins of the first to fifth abdominal segments carinated, the 

 carina3 not ending in spines ; sixth segment with six equidistant 

 longitudinal prominences, which are narrowed posteriorly, and 

 terminate each in a spine. Upper surface of telson armed with 



